Hi Manjunath,
I dont know whether you can restrict it using the authorization objects (as it might be either created in the back ground or in the foreground with different users)
I wanted to know if the shipment document type used by Plant A (supplying plant) is the same as the shipment document type used by the receiving plant (Plant B). If yes, then, the question is can you separate it? If you can separate it, then you can opt not to assign a shipment cost document to the shipment document type used by plant A. That way, you can restrict VI01 being created from supplying plant.
If the answer to the question (to separate the shipment doc) is no, then, you will have to use some kind of a development (user exit) to check if the delivery used by the shipment document is from the supplying plant or by the receiving plant. (I think you can use LIKP/LIPS, EKBE tables to find out). By this you can stop the shipment cost doc being created.
Hope this helps...
Regards,
Mukund S